Which of the following is a true statement about lipids in cell membrane?

True

Explanation:

The lipid portion of plasma membrane has cholesterol which is responsible for the fluidity of plasma membrane and acts like a liquid. Cholesterol depends upon the temperature and shows different effects in the membrane.

So, the correct statement is 'True'.

the answer is d.) homologous; have mammary glands

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.